FOSSIL FLOltA. 709 



lobes. As alread}' stated, tlie leaf is oljseurely oblong in general ontline, 

 being sliglith' wedge-shaped at base and having the strongest teeth or 

 lateral lobes ut about two-thirds of the distance from the base. The apex 

 is not preserved, but judging from tlie contour it must have been rather 

 obtuse. The teeth of tlie margin are also rather obtuse. The nervation is 

 strongly craspedodrome, the secondaries or liranclies all entering the teeth. 

 Only a few nervilles are preserved and those apj)ear broken. None of the 

 ultimate nervation has l)een preserved. 



This s])ecies is quite unlike any American fossil species with which I 

 am familiar. Among living species it approaches quite closely to occasional 

 leaves of Q. pr'moldcs Willd., of the eastern United States. The living 

 leaves incline to be more wedge-shaped at base and to have stronger teeth 

 separated by deejier sinuses. It is hardly probable that the resemblance is 

 close enough to warrant the assumption that Q. prhioidcs has actually 

 descended from this fossil form. 



I take pleasiu'e in having named this line species in honor of Prof 

 Gi-eorge E. Culver, some time professor of geology in the University of South 

 Dakota, who assisted me in making the collection of plants in the Yellow- 

 stone National Park. 



Habitat: Bank of Yellowstone River, one-half mile below the mouth 

 of Elk Creek ; top of l^luff 300 feet above stream, in white, coarse-grained 

 tuff; collected August 28, 1888, by F. H. Knowlton and G. E. Culver. 



QUERCUS HESPERIA n. sp. 



Leaf of firm texture, broadly lanceolate in outline, passing from about 

 the middle down into a long wedge-shaped base, rather abruptly pointed at 

 apex; margin with few (8 to 10) strong, sharp, upward-pointing teeth; 

 midrib strong; secondaries 10 to 12 pairs, alternate, straight or slightly 

 cui'ving, ending directly in the teeth; intermediate secondaries frequent, 

 about midway Ijetween the secondaries, disappearing about halfwa}" between 

 midrib and margin; nervilles irregular, producing large, coarse areolation; 

 finer nervation similar. 



The specimen upon which this species is founded is nearly perfect, 

 lacking only the tip. It is 6 cm. long and a little more than 2 cm. wide. 

 The lower half of the leaf is regularly wedge-shaped and the iqjper portion is 



